/**
 * common/toc — Índice de contenidos con scroll-spy.
 * Handle: pf_pfuture_component_toc
 *
 * Modos: --list (por defecto) y --steps (pasos numerados de T-10).
 * Modificadores: --sticky, --collapsible. Estado activo del scroll-spy:
 * .pf-toc__item.is-active.
 *
 * Tokens: solo los canónicos de style.css (issue #60), sin literales de respaldo.
 * `--pf-toc-offset` es token del componente: distancia al borde superior cuando el
 * índice va fijo, calculada a partir de la altura que publica la cabecera fija en
 * `--pf-header-height` (0 si la cabecera no es fija).
 */

.pf-toc {
  --pf-toc-offset: calc(var(--pf-header-height, 0px) + var(--pf-space-md));
  --pf-toc-rule: var(--pf-color-border);
  --pf-toc-link: var(--pf-color-text-soft);
  --pf-toc-active: var(--pf-color-brand);
  --pf-toc-step-bg: var(--pf-color-surface);
  --pf-toc-step-border: var(--pf-color-border);
  --pf-toc-step-text: var(--pf-color-text-soft);

  width: 100%;
  font-size: var(--pf-text-sm);
}

/* El salto a un ancla deja el encabezado por debajo de la cabecera fija. */
:where(h1, h2, h3, h4, h5, h6)[id] {
  scroll-margin-top: calc(var(--pf-header-height, 0px) + var(--pf-space-md));
}

.pf-toc--sticky {
  position: sticky;
  top: var(--pf-toc-offset);
  max-height: calc(100vh - var(--pf-toc-offset) - var(--pf-space-md));
  overflow-y: auto;
  overscroll-behavior: contain;
}

/* Titulo del indice: sin versalitas, en el color de titular (issue #112). */
.pf-toc__title {
  margin: 0;
  color: var(--pf-color-heading);
  font-size: var(--pf-text-sm);
  font-weight: var(--pf-weight-bold);
}

.pf-toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--pf-space-2xs);
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  text-align: left;
}

.pf-toc__toggle-icon {
  display: none;
}

.pf-toc__list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: var(--pf-space-sm) 0 0;
  padding: 0;
  list-style: none;
  border-inline-start: 2px solid var(--pf-toc-rule);
}

.pf-toc__item {
  position: relative;
}

.pf-toc__item--level-3,
.pf-toc__item--level-4 {
  font-size: var(--pf-text-xs);
}

.pf-toc__link {
  display: flex;
  gap: var(--pf-space-2xs);
  align-items: baseline;
  margin-inline-start: -2px;
  padding: var(--pf-space-2xs) var(--pf-space-sm);
  border-inline-start: 2px solid transparent;
  color: var(--pf-toc-link);
  line-height: var(--pf-leading-snug);
  text-decoration: none;
  transition: color var(--pf-transition), border-color var(--pf-transition);
}

.pf-toc__item--level-3 .pf-toc__link { padding-inline-start: var(--pf-space-lg); }
.pf-toc__item--level-4 .pf-toc__link { padding-inline-start: var(--pf-space-xl); }

.pf-toc__link:hover,
.pf-toc__link:focus-visible {
  color: var(--pf-toc-active);
}

.pf-toc__item.is-active > .pf-toc__link {
  border-color: var(--pf-toc-active);
  color: var(--pf-toc-active);
  font-weight: var(--pf-weight-medium);
}

/* Modo pasos numerados — T-10 · Tutorial. */
.pf-toc--steps .pf-toc__list {
  border-inline-start: 0;
  gap: var(--pf-space-2xs);
}

.pf-toc--steps .pf-toc__link {
  margin: 0;
  padding-inline-start: 0;
  border: 0;
  align-items: flex-start;
}

.pf-toc__step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid var(--pf-toc-step-border);
  border-radius: var(--pf-radius-pill);
  background: var(--pf-toc-step-bg);
  color: var(--pf-toc-step-text);
  font-size: var(--pf-text-xs);
  font-weight: var(--pf-weight-regular);
  font-variant-numeric: tabular-nums;
  transition: background-color var(--pf-transition), color var(--pf-transition), border-color var(--pf-transition);
}

.pf-toc--steps .pf-toc__text {
  padding-top: 0.2rem;
}

.pf-toc--steps .pf-toc__item.is-active > .pf-toc__link .pf-toc__step {
  border-color: var(--pf-toc-active);
  background: var(--pf-toc-active);
  color: var(--pf-color-text-invert);
}

.pf-toc--steps .pf-toc__item--level-3 .pf-toc__link {
  padding-inline-start: calc(1.75rem + var(--pf-space-2xs));
}

/* -------------------------------------------------------------------------
 * Móvil: el índice deja de ser fijo y, si es plegable, arranca plegado.
 * ---------------------------------------------------------------------- */

@media (max-width: 900px) {
  .pf-toc--sticky {
    position: static;
    max-height: none;
  }

  .pf-toc--collapsible {
    padding: var(--pf-space-sm) var(--pf-space-md);
    border: 1px solid var(--pf-toc-rule);
    border-radius: var(--pf-radius-md);
    background: var(--pf-color-surface);
  }

  .pf-toc__toggle-icon {
    display: inline-block;
    width: 0.6rem;
    height: 0.6rem;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform var(--pf-transition);
  }

  .pf-toc__toggle[aria-expanded="true"] .pf-toc__toggle-icon {
    transform: rotate(-135deg);
  }

  /* Con JS el botón manda; sin JS (sin la clase has-js) la lista queda abierta. */
  .pf-toc.has-js .pf-toc__toggle[aria-expanded="false"] + .pf-toc__list {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .pf-toc__link,
  .pf-toc__step,
  .pf-toc__toggle-icon {
    transition: none;
  }
}